for the first issue, edit line 144 of the cart page:
$_SESSION['WAEC_ContinueRedirect'] = $_SERVER['PHP_SELF'].($_SERVER['QUERY_STRING']?"?".htmlentities($_SERVER['QUERY_STRING']):"");
to:
$_SESSION['WAEC_ContinueRedirect'] = "/iday/book-now.php";
for the second issue, on the delegate-details.php page, save the submitted form to session variables, you can use those session variables on the pp_confirm page to send them in an email or save them to a database.